Secondary battery to which external insulation tape is applied and manufacturing method thereof

Abstract

The present invention relates to an external insulating tape attached to the outside of a case, a secondary battery to which the insulating tape is applied, and a manufacturing method thereof. The technical problem to be solved is to provide an insulating tape capable of being attached to the entire outer surface of a case including a surface on which an external terminal of a secondary battery is installed, a secondary battery to which the insulating tape is applied, and a manufacturing method thereof. To this end, the present invention provides a secondary battery comprising: an electrode assembly; a case in which the electrode assembly is embedded; a cap plate bonded to the case and including a terminal connected to the electrode assembly; and an insulating tape attached to an outer surface of the case, wherein the outer surface of the case comprises a surface of the cap plate, and the insulating tape comprises an upper surface attachment part attached to the surface of the cap plate.

Description

Secondary battery with external insulating tape applied and manufacturing method thereof

[0001] The present invention relates to a secondary battery, and more specifically, to an external insulating tape attached to the outside of a case, a secondary battery to which the insulating tape is applied, and a manufacturing method thereof.

[0002] Secondary batteries, unlike non-rechargeable primary batteries, are rechargeable and dischargeable. Low-capacity secondary batteries are used in small, portable electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while large-capacity secondary batteries are widely used as power sources for motor drives and power storage in hybrid and electric vehicles.

[0003] In general, a secondary battery includes an electrode assembly composed of positive and negative electrode plates, a case that accommodates the electrode assembly, a terminal connected to the electrode assembly, a cap plate that is bonded to the case and on which the terminal is installed, etc. In addition, the cap plate includes a vent for emitting (degassing) gas generated within the case, an electrolyte injection port for injecting electrolyte into the case, etc.

[0004] An external film (external insulating tape) is attached to the outer surface of the above case for protection, insulation, labeling convenience, etc. However, since components such as terminals, vents, and electrolyte injection ports are located on the cap plate, insulating tape cannot be attached.

[0005] The above-described information disclosed in the background technology of this invention is only intended to enhance understanding of the background of the present invention and may therefore include information that does not constitute prior art.

[0006] In conventional secondary battery cases, insulation tape cannot be attached to the surface where external terminals exist (e.g., cap plate), so insulation cannot be achieved. Therefore, metal foreign bodies or module structures (such as bus bars) may come into contact with this uninsulated surface, causing a short circuit.

[0007] Accordingly, the purpose of the present invention is to propose an insulating tape that can be attached to the entire outer surface of a case, including the surface where an external terminal of a secondary battery is installed, and a secondary battery using the insulating tape and a manufacturing method thereof.

[0008] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0009] According to one aspect of the present invention for solving the above technical problem, a secondary battery is provided, comprising: an electrode assembly; a case in which the electrode assembly is built; a cap plate including a terminal connected to the electrode assembly and bonded to the case; and an insulating tape attached to an outer surface of the case, wherein the outer surface of the case includes a surface of the cap plate, and the insulating tape includes an upper attachment portion attached to the surface of the cap plate.

[0010] In addition, according to another aspect of the present invention for solving the above technical problem, an insulating tape for a secondary battery is provided, which is attached to a secondary battery including a cap plate joined to a case, and includes an upper attachment portion attached to a surface of the cap plate, a first long-side attachment portion attached to a first long side of the case, a second long-side attachment portion attached to a second long side of the case, a first short-side attachment portion attached to a first short side of the case, a second short-side attachment portion attached to a second short side of the case, and a lower attachment portion attached to a lower surface of the case.

[0011] In addition, according to another aspect of the present invention for solving the above technical problem, a method for manufacturing a secondary battery is provided, including the steps of manufacturing an electrode assembly; manufacturing a case in which the electrode assembly is built and inserting the electrode assembly; manufacturing a cap plate in which a terminal connected to the electrode assembly is assembled and joining the cap plate to the case; manufacturing an insulating tape to be attached to an outer surface of the case; and attaching the insulating tape to an outer surface of the case, including a surface of the cap plate.

[0012] In the past, insulation tape could not be attached to the surface (cap plate surface) where terminals existed outside the case, so insulation was not provided. Therefore, metal foreign bodies or module structures (such as bus bars) would come into contact with this uninsulated surface, causing a short circuit. However, the insulation tape that can be attached to the entire surface of the case according to the present invention can insulate all surfaces of the case with only the tape without any additional parts.

[0013] However, the effects that can be obtained through the present invention are not limited to the effects described above, and other technical effects not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0014] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in the drawings.

[0015] Figure 1 is a top perspective view of a secondary battery according to an example.

[0016] Figure 2 is a cross-sectional view II' of Figure 1.

[0017] Figure 3 is a perspective view of the exterior of a conventional secondary battery with external insulating tape attached.

[0018] Figure 4 is an example development diagram of an insulating tape that can be used in a conventional secondary battery case.

[0019] Figure 5 shows an example of attaching the insulating tape of Figure 4 to a secondary battery case.

[0020] Figure 6 is a perspective view of the exterior of a secondary battery with an insulating tape attached according to the present invention.

[0021] Figure 7 is an expanded view of an insulating tape according to one embodiment of the present invention.

[0022] Figure 8 shows an example of attaching the insulating tape illustrated in Figure 7 to a secondary battery case.

[0023] Figure 9 is an explanatory diagram of the distance margin d between the outer line of the first terminal or the second terminal and the boundary line of the first terminal exposed portion or the second terminal exposed portion.

[0024] Figure 10 illustrates various shapes of the rupture inducing portion.

[0025] Fig. 11 shows another embodiment of the insulating tape shown in Fig. 7.

[0026] Fig. 12 shows another embodiment of the insulating tape shown in Fig. 11.

[0027] Figure 13 is an example diagram of a secondary battery module in which secondary batteries manufactured according to the present invention are arranged.

[0028] Fig. 14 is an example diagram of a secondary battery pack including the secondary battery module of Fig. 13.

[0029] Figure 15 is a conceptual diagram showing the secondary battery pack of Figure 14 installed in a vehicle.

[0030] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that terms and words used in this specification and claims should not be interpreted as limited to their conventional or dictionary meanings, and should be interpreted with meanings and concepts that conform to the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of a term to best explain his or her invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

[0031] Additionally, when used herein, the terms "comprise", "include" and / or "comprising", "including" specify the presence of stated features, numbers, steps, operations, elements, elements, and / or groups thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, elements, elements, and / or groups thereof.

[0032] Additionally, to facilitate understanding of the invention, the attached drawings are not drawn to scale and some components may be exaggerated in size. Furthermore, identical components may be assigned the same reference numbers in different embodiments.

[0033] The statement that two compared objects are "identical" means "substantially identical." Therefore, "substantially identical" may include deviations considered low in the art, such as deviations of less than 5%. Furthermore, uniformity of a parameter over a given range may also mean uniformity on average.

[0034] Although the terms first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are used only to distinguish one component from another, and unless otherwise specified, a first component may also be a second component.

[0035] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0036] Any configuration being placed "on (or under)" or "above (or below)" a component may mean not only that any configuration is placed in contact with the upper surface (or lower surface) of said component, but also that other configurations may intervene between said component and any configuration placed on (or below) said component.

[0037] Additionally, when a component is described as being "on," "connected to," or "coupled to" another component, it should be understood that the components may be directly connected or coupled to one another, but that other components may also be "interposed" between the components, or that each component may be "connected," "coupled," or "connected" through other components.

[0038] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Furthermore, the use of "may" when describing embodiments of the present invention refers to "one or more embodiments of the present invention." Expressions such as "one or more" and "one or more" preceding a list of elements modify the list as a whole and do not modify individual elements within the list.

[0039] When reference is made throughout the specification to “A and / or B,” this means A, B, or A and B, unless otherwise stated, and when reference is made to “C through D,” this means C or more and D or less, unless otherwise stated.

[0040] When phrases such as "at least one of A, B, and C," "at least one of A, B, or C," "at least one selected from the group A, B, and C," or "at least one selected from A, B, and C," are used to specify a list of elements A, B, and C, the phrases can refer to any suitable combination.

[0041] The term "use" may be considered synonymous with the term "utilize." As used herein, the terms "substantially," "about," and similar terms are used as terms of approximation rather than degrees, and are intended to take into account inherent variations in measured or calculated values ​​that would be recognized by those skilled in the art.

[0042] Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or cross-section from another element, component, region, layer, or cross-section. Thus, a first element, component, region, layer, or section discussed below could also be termed a second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0043] For ease of description, spatially relative terms such as "beneath," "below," "lower," "above," "upper," and the like may be used in the specification to describe the relationship of one element or feature to other element(s) or features as depicted in the drawings. It will be understood that spatially relative positions encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the drawings is turned over, other elements are understood to be "beneath" or "below," and the depicted elements are understood to be "above" or "above" other elements. Thus, the term "beneath" can encompass both the above and below orientations.

[0044] The terms used herein are for the purpose of describing embodiments of the invention and are not intended to limit the invention.

[0045] Figure 1 is a top perspective view of a secondary battery to which the present invention can be applied.

[0046] The case (51) forms the overall appearance of the square secondary battery and may be formed of a conductive metal such as aluminum, an aluminum alloy, or nickel-plated steel. In addition, the case (51) may provide a space in which the electrode assembly is accommodated.

[0047] The cap assembly (60) may include a cap plate (61) covering the opening of the case (51), and the case (60) and the cap plate (61) may be made of a conductive material. Here, the first terminal (63) and the second terminal (62) may be installed to protrude outward by penetrating the cap plate (61) and being electrically connected to the positive or negative electrode inside.

[0048] An electrolyte injection port (64) may be formed in the cap plate (61) and sealed with a sealing plug, and a vent (66) with a notch (65) may be installed to discharge (degassing) gas generated inside the battery.

[0049] Fig. 2 is a cross-sectional view taken along line II' of Fig. 1. Referring to Fig. 2, the internal structure of a square secondary battery and the connection structure with the cap assembly (60) will be described.

[0050] The square secondary battery illustrated in FIG. 2 may basically include an electrode assembly (40), a first current collector (41), a first terminal (62), a second current collector (42), a second terminal (63), and a cap assembly (60).

[0051] The electrode assembly (40) may be formed by winding or stacking a stack of a first electrode plate, a separator, and a second electrode plate formed in a plate shape or a film shape. When the electrode assembly (40) is a rolled stack (aka jelly roll), the rolling axis may be parallel to the longitudinal direction of the case. In addition, the electrode assembly (40) may be a stack type rather than a rolled type, but the shape of the electrode assembly (40) is not limited in the present invention. In addition, the electrode assembly (40) may be a Z-stack electrode assembly in which the first electrode plate and the second electrode plate are inserted on both sides of a separator folded in a Z shape. In addition, the electrode assembly (40) may be stored inside the case by stacking one or more electrode assemblies so that their long sides are adjacent to each other, but the number of electrode assemblies is not limited in the present invention. The first electrode plate of the electrode assembly (40) can serve as a cathode and the second electrode plate can serve as an anode, or vice versa.

[0052] The first electrode plate is formed by applying a first electrode active material such as graphite or carbon to a substrate formed of a metal foil such as copper, a copper alloy, nickel, or a nickel alloy, and may include a first electrode tab (or a first non-coated region) which is a region where the first electrode active material is not applied. The first electrode tab (43) may be a passage for current flow between the first electrode plate and the first current collector (41). In some examples, the first electrode tab (43) may be formed by cutting the first electrode plate in advance so as to protrude to one side when manufacturing the first electrode plate, and may protrude further to one side than the separator without separate cutting.

[0053] The second electrode plate is formed by applying a second electrode active material such as a transition metal oxide to a substrate formed of a metal foil such as aluminum or an aluminum alloy, and may include a second electrode tab (or second non-coated portion) (44) which is a region where the second electrode active material is not applied. The second electrode tab (44) may be a passage for current flow between the second electrode plate and the second current collector (42). In some examples, the second electrode tab (44) may be formed by cutting the second electrode plate in advance so as to protrude to the other side when manufacturing the second electrode plate, and may protrude further to the other side than the separator without separate cutting.

[0054] In some embodiments, the first electrode tab (43) may be positioned on the right side of the electrode assembly (40), and the second electrode tab (44) may be positioned on the left side of the electrode assembly (40), or may be positioned on one side in the same direction. Also, in some embodiments, the first electrode tab (43) and the second electrode tab (44) may be positioned on the upper portion of the electrode assembly (40).

[0055] Here, left, right, and top are for convenience of explanation based on the secondary battery illustrated in Fig. 1, and their positions may change when the secondary battery rotates left, right, or up and down.

[0056] The separator functions to prevent short circuiting between the first and second electrode plates while allowing the movement of lithium ions. The separator may be composed of, for example, a polyethylene film, a polypropylene film, a polyethylene-polypropylene film, or the like.

[0057] The first electrode tab (43) of the first electrode plate and the second electrode tab (44) of the second electrode plate extend from both ends of the electrode assembly (40) as described above. In some embodiments, the electrode assembly (40) may be accommodated in a case (51) together with an electrolyte.

[0058] In the electrode assembly (40), the first electrode tabs (43) and the second electrode tabs (44) extending from the first electrode plate and the second electrode plate to both sides can be connected to the first collector (41) and the second collector (42) by welding, respectively. In some embodiments where the first electrode tabs (43) and the second electrode tabs (44) are positioned at the upper portion of the electrode assembly (40) as mentioned above, the first collector and the second collector can be positioned at the upper portion of the electrode assembly (40).

[0059] The first collector (41) and the second collector (42) can be electrically connected to the first terminal (62) and the second terminal (63) described in Fig. 1, respectively, through a connecting member (67). In some embodiments, the outer circumferential surface of the connecting member (67) can be threaded, and can be fastened to the first terminal (62) and the second terminal (63) through a screw connection. However, the present invention is not limited thereto, and the connecting member (67) can also be fastened to the first terminal (62) and the second terminal (63) by riveting or welding.

[0060] Figure 3 is a perspective view of the exterior of a secondary battery with a conventional external insulating tape (100) attached.

[0061] First, let us define the names of the six sides of the illustrated square secondary battery case (51). The secondary battery case (51) shown in Fig. 3 is a hexahedron as a whole, and may be composed of opposing first long sides (54a) and second long sides (54b), opposing first short sides (55a) and second short sides (55b), and opposing upper surfaces (56a) and lower surfaces (56b).

[0062] In Fig. 3, it can be seen that insulating tape is attached to the first long side (54a), the second long side (54b), the first short side (55a), the second short side (55b), and the lower surface (56b) of the cap plate (61) of the secondary battery case (51), excluding the upper surface (56a). Since terminals (62, 63), an electrolyte injection port (64), and a vent (66) are installed on the cap plate (61) constituting the cap assembly, it is difficult to attach the insulating tape (100), and therefore the surface of the cap plate (61) is exposed without being insulated.

[0063] Fig. 4 is an exemplary development diagram of an insulating tape (100) that can be used in a conventional secondary battery case such as Fig. 3. And Fig. 5 is a schematic diagram for explaining the appearance of attaching an insulating tape (100) to a secondary battery case (51).

[0064] Referring to the development diagram illustrated in FIG. 4, the conventional secondary battery insulating tape (100) includes a lower attachment portion (110) attached to the lower surface (56b) of the secondary battery case (51), a first long side attachment portion (120) attached to the first long side (54a), a second long side attachment portion (130) attached to the second long side (54b), a first short side attachment portion (140) attached to the first short side (55a), and a second short side attachment portion (150) attached to the second short side (55b).

[0065] Additionally, in this insulating tape (100), another first short-side attachment portion (140') and a second short-side attachment portion (150') that overlap with the first short-side attachment portion (140) and the second short-side attachment portion (150) and are attached to the first short-side (55a) and the second short-side (55b), respectively, can be connected to the second long-side attachment portion (130). This minimizes the gap that may occur when attaching the tape, thereby ensuring the insulating performance. In addition, the lower attachment portion (110) may be provided with a first short-side lower lining portion (160) and a second short-side lower lining portion (170) to block the gap that may occur at the lower edges of the first short-side (55a) and the second short-side (55b).

[0066] A first I-cutting portion (180) in the form of a slit may be formed between each of a pair of first short-side attachment portions (140, 140') and the first short-side lower lining portion (160), and a second I-cutting portion (180) in the form of a slit may be formed between each of a pair of second short-side attachment portions (150, 150') and the second short-side lower lining portion (170) to separate them. The I-cutting portion (180) is intended to facilitate attachment to a secondary battery case by folding adjacent areas.

[0067] The I-cutting section (180) can be formed by cutting the fabric together with the insulating tape (100) when manufacturing it in the form of a sheet as shown in the development diagram of FIG. 4, or it can be cut separately using a cutter or the like when attaching it to the secondary battery later without being formed during manufacturing.

[0068] The attachment order of the conventional insulating tape (100) configured in this way is as shown in FIG. 5. The adhesive surface of the insulating tape (100) is prepared by peeling off the protective film (not shown) that is placed on the adhesive surface of the insulating tape to which the adhesive is applied, and the adhesive surface is placed upward, and the lower surface (56b) of the secondary battery case (51) is placed on the lower attachment portion (100) to attach it first, and then the corresponding attachment portions of the insulating tape (100) are attached to the first and second long sides (54a, 54b) and the first and second short sides (55a, 55b).

[0069] Figure 6 is a perspective view of the exterior of a secondary battery with an insulating tape (200) attached according to one embodiment of the present invention.

[0070] Unlike the conventional secondary battery shown in FIG. 3, it can be seen that an insulating tape (200) is attached to the cap plate of the upper surface (56a) of the secondary battery so that the terminals (62, 63) of the cap assembly are exposed through the openings (291, 292). In addition, a rupture inducing portion (293) is formed at a position corresponding to a vent (66 in FIG. 3) that ruptures to discharge gas when an event occurs within the secondary battery, so that degassing due to rupture of the vent (66) when an event occurs is not hindered. Meanwhile, since a sealing plug is inserted and bonded to the electrolyte injection port (64 in FIG. 3), it may be covered with tape. Therefore, in FIG. 6, the electrolyte injection port (64 in FIG. 3) is covered with an insulating tape (200), so that the electrolyte injection port (64) is not visible.

[0071] According to the present invention, an insulating tape (200) can be attached to all surfaces including the upper surface (56a) corresponding to the surface of the cap plate of the secondary battery case, the first long side (54a), the second long side (54b), the first short side (55a), the second short side (55b), and the lower surface (56b).

[0072] FIG. 7 is a development diagram of one embodiment of an insulating tape (200) capable of covering and insulating all surfaces of a secondary battery as illustrated in FIG. 6. The insulating tape (200) according to the embodiment of FIG. 7 may include an upper surface attachment portion (290) attached to an upper surface (56a) of a secondary battery case, a first long side attachment portion (220) attached to a first long side (54a) of the secondary battery case, a second long side attachment portion (230) attached to a second long side (54b) of the secondary battery case, a first short side attachment portion (240) attached to a first short side (55a) of the secondary battery case, a second short side attachment portion (250) attached to a second short side (55b) of the secondary battery case, and a lower surface attachment portion (210) attached to a lower surface (56b) of the secondary battery case.

[0073] Additionally, in this insulating tape (200), another first short-side attachment portion (240') and a second short-side attachment portion (250') attached to the first short side (55a) and the second short side (55b), respectively, with or without overlapping with the first short-side attachment portion (240) and the second short-side attachment portion (250), may be connected to the second long-side attachment portion (230). These another first short-side attachment portion (240') and second short-side attachment portion (250') may completely or partially overlap with the first short-side attachment portion (240) and the second short-side attachment portion (250), and their respective edges may face each other without overlapping. In the case where their respective edges face each other without overlapping, it is preferable that their edges are in close contact with each other in order to minimize a gap through which the outer surface of the case may be exposed.

[0074] In addition, in addition to the lower attachment portion (210) connected to the first long-side attachment portion (220) illustrated as being positioned at the top in FIG. 7, another lower attachment portion (210') connected to the second long-side attachment portion (230) illustrated as being positioned at the bottom may be added. These lower attachment portions 210 and 210' may also completely overlap or partially overlap each other, or their respective edges may face each other without overlapping. In the case where their respective edges face each other without overlapping, it is preferable that their edges are in close contact with each other in order to minimize a gap that may expose the outer surface of the case.

[0075] Also, similarly to the case of FIG. 4, the lower attachment portion (210) may be provided with a first short-side lower lining portion (260) and a second short-side lower lining portion (270) to block a gap that may occur at the lower edges of the first short side (55a) and the second short side (55b). In addition, another lower attachment portion (210') may be provided with another first short-side lower lining portion (260') and a second short-side lower lining portion (270') to block a gap that may occur at the lower edges of the first short side (55a) and the second short side (55b).

[0076] In addition, the upper attachment portion (290) may additionally be provided with a first short side upper lining portion (300) and a second short side upper lining portion (310) to block a gap that may occur at the upper edges of the first short side (55a) and the second short side (55b).

[0077] Similar to the case of FIG. 4, a slit-shaped I-cutting portion (280) may be formed between each of a pair of first short-side attachment portions (240, 240') and each of a pair of first short-side lower lining portions (260, 260'), and between each of a pair of second short-side attachment portions (250, 250') and each of a pair of second short-side lower lining portions (270, 270') to separate them. In addition, in this embodiment, since the upper attachment portion (290) is added, an I-cutting portion (280) can be additionally formed between each of a pair of first short-side attachment portions (240, 240') and the first short-side upper lining portion (300), and also between each of a pair of second short-side attachment portions (250, 250') and the second short-side upper lining portion (310).

[0078] As mentioned above, these I-cutting portions (280) can be formed by cutting together with other portions when manufacturing the insulating tape (200), as shown in the development diagram of FIG. 7, or can be cut separately using a cutter or the like when attaching to the secondary battery, not during manufacturing.

[0079] A first terminal exposure portion (291) and a second terminal exposure portion (292) may be formed on the upper surface attachment portion (290) so that the first terminal (62) and the second terminal (63) are not covered and the terminals can be exposed by passing through them. The first terminal exposure portion (291) and the second terminal exposure portion (292) may be cut so that the first and second terminals and related members (e.g., insulating members) can pass through them. The upper surface attachment portion (290) may also be formed with a rupture inducing portion (293) that is formed at a position corresponding to a notch (65 in FIG. 1) that ruptures when the pressure of the gas generated when an event occurs inside the secondary battery mentioned above exceeds a predetermined threshold value, thereby inducing rupture of the upper surface attachment portion (290). The rupture inducing portion (293) will be described separately.

[0080] Fig. 8 illustrates a method for attaching an insulating tape (200) manufactured as in the development diagram of Fig. 7 to a secondary battery case. The process for attaching the insulating tape (200) of Fig. 8 will be described with reference to Fig. 7.

[0081] The external insulating tape (200) with the adhesive surface protection removed can be folded along the dotted line of the development diagram shown in Fig. 7, and the adhesive surface can be placed on the upper surface (56a) of the secondary battery case with the upper surface attachment portion (290) facing downward to be attached.

[0082] Next, the corresponding attachment parts (i.e., the first side attachment part (220) and the second side attachment part (230)) can be attached to the first and second sides (54a, 54b) of the secondary battery case.

[0083] Thereafter, in order to block a gap that may occur at the upper edges of the first short side (55a) and the second short side (55b), the first short side upper lining part (300) and the second short side upper lining part (310) may be attached to the upper portions of the first and second short sides (55a, 55b) of the secondary battery case, respectively. Subsequently, a pair of first short side attachment parts (240, 240') and a pair of second short side attachment parts (250, 250') may be attached to the first and second short sides (55a, 55b) of the secondary battery case, respectively. In another embodiment, the order may be reversed, and a pair of first short-side attachment parts (240, 240') and a pair of second short-side attachment parts (250, 250') may be first attached to the first and second short sides (55a, 55b) of the secondary battery case, and then the first short-side upper lining part (300) and the second short-side upper lining part (310) may be attached to the first and second short sides (55a, 55b) of the secondary battery case, respectively.

[0084] Finally, in order to prevent a gap that may occur at the lower edges of the first short side (55a) and the second short side (55b), a pair of first short side lower lining parts (260, 260') and a pair of second short side lower lining parts (270, 270') may be attached to the lower portions of the first and second short sides (55a, 55b) of the secondary battery case. Subsequently, a pair of lower attachment parts (210, 210') may be attached to the lower portion (56b) of the secondary battery case. In another embodiment, the order may be reversed, and a pair of lower attachment parts (210, 210') may be first attached to the lower surface (56b) of the secondary battery case, and then a pair of first short-side lower lining parts (260, 260') and a pair of second short-side lower lining parts (270, 270') may be attached to the lower surfaces of the first and second short sides (55a, 55b) of the secondary battery case.

[0085] Figure 9 is an explanatory diagram of the distance margin d between the outer line of the first terminal (62) or the second terminal (63) and the boundary line of the first terminal exposed portion (291) or the second terminal exposed portion (292).

[0086] The distance margin d can be determined by a trade-off between the insulating performance of the cap plate (61) on the upper surface of the secondary battery case, the productivity and work error during the insulating tape (200) attachment process, and the size tolerance during the manufacturing of the insulating tape (200). In order to appropriately satisfy these factors, the distance margin d is preferably about 1 mm, and considering a dispersion of ±0.5 mm, it can be within the range of d = 0.5 to 1.5 mm.

[0087] Referring again to FIG. 7, the upper attachment portion (290) may also be formed with a rupture inducing portion (293) formed at a position corresponding to the notch (65 in FIG. 1) that ruptures when the gas inside the case exceeds a predetermined pressure, as previously mentioned. The rupture inducing portion (293) is formed so that the corresponding position of the insulating tape (200) can rupture so as not to impede the gas from escaping when the notch (65) ruptures even when the vent (66) is covered by the insulating tape (200).

[0088] Fig. 10 illustrates various shapes of the rupture inducing part (293). In Fig. 10, the rupture inducing part (293) may be composed of a main line (293a) and short auxiliary lines (293b) connected at approximately right angles to both ends of the main line. The main line (293a) may be a solid line or a stitched line (broken line, dotted line, etc.), and the auxiliary line (293b) may be a compound diagonal line such as > or < or a straight line such as |. The main line (293a) and the auxiliary line (293b) may be formed by digging a groove that goes only a part of the depth in the thickness direction of the insulating tape (200). However, the present invention is not limited thereto, and for example, depending on the material of the insulating tape (200) or in consideration of the insulating performance, the rupture inducing part may be a cut line that is completely cut across the entire thickness of the insulating tape (200).

[0089] The rupture strength and rupture pattern of the rupture induction unit (293) can be designed to correspond to the notch (65) that ruptures when an event occurs in the secondary battery.

[0090] Additionally, the rupture induction unit (293) may not be composed of lines but may be composed of various shapes, letters, symbols, etc. (e.g., a manufacturer's trademark or business name).

[0091] Fig. 11 shows another embodiment of the insulating tape (200) of the unfolded shape shown in Fig. 7.

[0092] In the insulating tape (200) shown in FIG. 11, the width of the first short-side attachment portion (240) shown in FIG. 7 may be formed to be almost the same as the width of the first short-side (55a) of the secondary battery case, and a first short-side vertical lining portion (320) may be included in which the width of another first short-side attachment portion (240') is reduced so that it can be added only to the vertical edge of the first short-side (55a).

[0093] In addition, this insulating tape (200) may include a second short-side vertical lining portion (330) in which the width of the second short-side attachment portion (250) illustrated in FIG. 7 may be formed to be almost the same as the width of the second short-side (55b) of the secondary battery case, and the width of another second short-side attachment portion (250') may be reduced so that it can be added only to the vertical edge of the second short-side (55b).

[0094] In addition, this insulating tape (200) may include a lower horizontal lining portion (340) in which the width of the lower attachment portion (210) illustrated in FIG. 7 may be formed to be almost the same as the width of the lower surface (56b) of the secondary battery case, and the width of another lower attachment portion (210') may be reduced so that it can be added only to the horizontal corner of the lower surface (56b).

[0095] By the first short-side vertical lining portion (320), the second short-side vertical lining portion (330), and the lower horizontal lining portion (340) having reduced widths, the first short-side lower lining portion 260' and the second short-side lower lining portion 270' shown in Fig. 7 can be deleted.

[0096] Fig. 12 illustrates another embodiment of an insulating tape (200), which is an expanded view of an insulating tape (200) for a secondary battery in which the vent (66) is located at the bottom of the case rather than on the cap plate at the top of the case. In the case of a secondary battery having an extended length-to-width ratio (so-called tall cell), the vent may be installed at the bottom of the case due to insufficient space in the cap plate.

[0097] Therefore, in the insulating tape according to the present embodiment, the rupture inducing portion (294) may be formed on the lower attachment portion (210) of the insulating tape (200) rather than the upper attachment portion (290) as in FIG. 7 or FIG. 11. Other components of the insulating tape of FIG. 12 may be similar to those of FIG. 11 except for their shapes. The insulating tape of FIG. 12 is for application to a vertically extended secondary battery case (tall cell), and the insulating tape of FIG. 11 is for application to a horizontally rectangular secondary battery case, so there is a difference in the shapes of the two.

[0098] A method for manufacturing a secondary battery according to the present invention will be described. The method for manufacturing a secondary battery is substantially similar to conventional manufacturing methods, except for the step of attaching the insulating tape (200) described above to the secondary battery case. The following description will refer to the development diagram of the insulating tape (200) shown in FIG. 7 and the method for attaching the insulating tape (200) shown in FIG. 8 .

[0099] The method for manufacturing a secondary battery of the present invention may include a step of manufacturing an electrode assembly; a step of manufacturing a case in which the electrode assembly is built and inserting the electrode assembly; a step of manufacturing a cap plate in which a terminal connected to the electrode assembly is assembled and joining the cap plate to the case; a step of manufacturing an insulating tape to be attached to an outer surface of the case; and a step of attaching the insulating tape to an outer surface of the case, including an upper surface of the case corresponding to a surface of the cap plate.

[0100] In the above insulating tape manufacturing step, as shown in FIG. 7, a step of cutting an insulating tape including an upper attachment portion (290), a first long-side attachment portion (220), a second long-side attachment portion (230), a first short-side attachment portion (240), a second short-side attachment portion (250), and a lower attachment portion (210) as a single unit from a fabric may be included.

[0101] In addition, in the step of manufacturing the insulating tape, another first short-side attachment portion (240') and a second short-side attachment portion (250') may be formed by being connected to the second long-side attachment portion (230) and attached to the first short side (55a) and the second short side (55b), respectively, with or without overlapping with the first short-side attachment portion (240) and the second short-side attachment portion (250). These another first short-side attachment portion (240') and second short-side attachment portion (250') may completely or partially overlap with the first short-side attachment portion (240) and the second short-side attachment portion (250), and their respective edges may face each other without overlapping. In the case where their respective edges face each other without overlapping, it is preferable to bring their edges into close contact with each other in order to minimize a gap through which the outer surface of the case may be exposed.

[0102] In addition, in the insulating tape manufacturing step, in addition to the lower attachment portion (210) connected to the first long-side attachment portion (220) shown as being positioned at the top in FIG. 7, another lower attachment portion (210') connected to the second long-side attachment portion (230) shown as being positioned at the bottom may be additionally formed. These lower attachment portions 210 and 210' may also completely overlap or partially overlap each other, and their respective edges may face each other without overlapping. In the case where their respective edges face each other without overlapping, it is preferable to bring their edges into close contact with each other in order to minimize a gap that may expose the outer surface of the case.

[0103] In addition, in the above-described insulating tape manufacturing step, a first short-side lower lining portion (260) and a second short-side lower lining portion (270) may be formed on the lower attachment portion (210) to block a gap that may occur at the lower edges of the first short side (55a) and the second short side (55b). In addition, another first short-side lower lining portion (260') and a second short-side lower lining portion (270') may be formed on another lower attachment portion (210') to block a gap that may occur at the lower edges of the first short side (55a) and the second short side (55b).

[0104] In addition, in the above insulating tape manufacturing step, a first short side upper lining portion (300) and a second short side upper lining portion (310) may be additionally formed to block a gap that may occur at the upper edges of the first short side (55a) and the second short side (55b) of the upper surface attachment portion (290).

[0105] In addition, in the step of manufacturing the insulating tape, similarly to the case of FIG. 4, a first I-cutting portion (280) in the form of a slit may be formed between each of a pair of first short-side attachment portions (240, 240') and each of a pair of first short-side lower lining portions (260, 260'), and between each of a pair of second short-side attachment portions (250, 250') and each of a pair of second short-side lower lining portions (270, 270') to separate them. In addition, a second I-cutting portion (280) may be additionally formed between each of a pair of first short-side attachment portions (240, 240') and the first short-side upper lining portion (300), and between each of a pair of second short-side attachment portions (250, 250') and the second short-side upper lining portion (310).

[0106] These I-cutting portions (280) may be formed by cutting together with other portions in the insulating tape manufacturing step, or may be cut separately using a cutter or the like when attaching to the case in the insulating tape attaching step.

[0107] In addition, in the above-described insulating tape manufacturing step, a first terminal exposure portion (291) and a second terminal exposure portion (292) may be formed so that the first terminal (62) and the second terminal (63) may pass through and be exposed to the upper surface attachment portion (290). The first terminal exposure portion (291) and the second terminal exposure portion (292) may be cut so that the first and second terminals and related members (e.g., insulating members) may pass through.

[0108] In addition, in the above-described insulating tape manufacturing step, a rupture inducing portion (293, 294) may be formed at a position corresponding to a notch (65 in FIG. 1) that ruptures when the pressure of gas generated when an event occurs inside the secondary battery exceeds a predetermined threshold value, in one of the upper attachment portion (290) and the lower attachment portion (210, 210').

[0109] Now, the steps for attaching the above insulating tape will be described.

[0110] The external insulating tape (200) with the adhesive surface protection removed can be folded along the dotted line of the development diagram shown in Fig. 7, and the adhesive surface can be placed on the upper surface (56a) of the secondary battery case with the upper surface attachment portion (290) facing downward to be attached.

[0111] Next, the corresponding attachment parts (i.e., the first side attachment part (220) and the second side attachment part (230)) can be attached to the first and second sides (54a, 54b) of the secondary battery case.

[0112] Thereafter, in order to block a gap that may occur at the upper edges of the first short side (55a) and the second short side (55b), the first short side upper lining part (300) and the second short side upper lining part (310) may be attached to the upper portions of the first and second short sides (55a, 55b) of the secondary battery case, respectively. Subsequently, a pair of first short side attachment parts (240, 240') and a pair of second short side attachment parts (250, 250') may be attached to the first and second short sides (55a, 55b) of the secondary battery case, respectively. In another embodiment, the order may be reversed, and a pair of first short-side attachment parts (240, 240') and a pair of second short-side attachment parts (250, 250') may be first attached to the first and second short sides (55a, 55b) of the secondary battery case, and then the first short-side upper lining part (300) and the second short-side upper lining part (310) may be attached to the first and second short sides (55a, 55b) of the secondary battery case, respectively.

[0113] Finally, in order to prevent a gap that may occur at the lower edges of the first short side (55a) and the second short side (55b), a pair of first short side lower lining parts (260, 260') and a pair of second short side lower lining parts (270, 270') may be attached to the lower portions of the first and second short sides (55a, 55b) of the secondary battery case. Subsequently, a pair of lower attachment parts (210, 210') may be attached to the lower portion (56b) of the secondary battery case. In another embodiment, the order may be reversed, and a pair of lower attachment parts (210, 210') may be first attached to the lower surface (56b) of the secondary battery case, and then a pair of first short-side lower lining parts (260, 260') and a pair of second short-side lower lining parts (270, 270') may be attached to the lower surfaces of the first and second short sides (55a, 55b) of the secondary battery case.

[0114] Below, materials that can be used in a secondary battery according to the present invention are described.

[0115] A compound capable of reversible intercalation and deintercalation of lithium (a lithiated intercalation compound) can be used as a cathode active material. Specifically, one or more of a composite oxide of lithium and a metal selected from cobalt, manganese, nickel, and combinations thereof can be used.

[0116] The above composite oxide may be a lithium transition metal composite oxide, and specific examples thereof include lithium nickel-based oxide, lithium cobalt-based oxide, lithium manganese-based oxide, lithium iron phosphate-based compound, cobalt-free nickel-manganese-based oxide, or a combination thereof.

[0117] As an example, a compound represented by any one of the following chemical formulas may be used: Li a A 1-b X b O 2-c D c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Mn 2-b Xb About 4-c D c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Ni 1-b-c Co b X c About 2-α D α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<α<2); Li a Ni 1-b-c Mn b X c About 2-α D α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<α<2); Li a Ni b Co c L 1 d G e O2(0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0≤e≤0.1); Li a NiG b O2(0.90≤a≤1.8, 0.001≤b≤0.1); Li a CoG b O2(0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-b G b O2(0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn2G b O4(0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-g G g PO4(0.90≤a≤1.8, 0≤g≤0.5); Li (3-f) Fe2(PO4)3(0≤f≤2); Li a FePO4(0.90≤a≤1.8).

[0118] In the above chemical formula, A is Ni, Co, Mn, or a combination thereof; X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, or a combination thereof; D is O, F, S, P, or a combination thereof; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof; L 1 is Mn, Al, or a combination thereof.

[0119] A positive electrode for a secondary battery may include a current collector and a positive electrode active material layer formed on the current collector. The positive electrode active material layer includes a positive electrode active material and may further include a binder and / or a conductive material.

[0120] The content of the positive electrode active material may be 90 wt% to 99.5 wt% with respect to 100 wt% of the positive electrode active material layer, and the contents of the binder and conductive material may be 0.5 wt% to 5 wt%, respectively, with respect to 100 wt% of the positive electrode active material layer.

[0121] The above-mentioned collector may be made of Al, but is not limited thereto.

[0122] The negative electrode active material includes a material capable of reversibly intercalating / deintercalating lithium ions, lithium metal, an alloy of lithium metal, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0123] The material capable of reversibly intercalating / deintercalating the lithium ions may include a carbon-based negative electrode active material, for example, crystalline carbon, amorphous carbon, or a combination thereof. Examples of the crystalline carbon include graphite such as natural graphite or artificial graphite, and examples of the amorphous carbon include soft carbon or hard carbon, mesophase pitch carbide, calcined coke, and the like.

[0124] As the material capable of doping and dedoping the lithium, a Si-based negative electrode active material or a Sn-based negative electrode active material can be used. The Si-based negative electrode active material is silicon, a silicon-carbon composite, SiO x (0 <x<2), Si계 합금, 또는 이들의 조합일 수 있다.

[0125] The above silicon-carbon composite may be a composite of silicon and amorphous carbon. According to one embodiment, the silicon-carbon composite may be in the form of silicon particles and amorphous carbon coated on the surface of the silicon particles.

[0126] The silicon-carbon composite may further comprise crystalline carbon. For example, the silicon-carbon composite may comprise a core comprising crystalline carbon and silicon particles and an amorphous carbon coating layer positioned on the surface of the core.

[0127] A negative electrode for a lithium secondary battery includes a current collector and a negative electrode active material layer positioned on the current collector. The negative electrode active material layer includes a negative electrode active material and may further include a binder and / or a conductive material.

[0128] For example, the negative electrode active material layer may include 90 to 99 wt% of the negative electrode active material, 0.5 to 5 wt% of the binder, and 0 to 5 wt% of the conductive material.

[0129] The above binder may be a non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof. When an aqueous binder is used as the negative electrode binder, a cellulose-based compound capable of imparting viscosity may be further included.

[0130] The negative electrode current collector may be selected from copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, a polymer substrate coated with a conductive metal, and a combination thereof.

[0131] The electrolyte for a lithium secondary battery contains a non-aqueous organic solvent and a lithium salt.

[0132] The above non-aqueous organic solvent acts as a medium through which ions involved in the electrochemical reaction of the battery can move.

[0133] The above non-aqueous organic solvent may be a carbonate-based, ester-based, ether-based, ketone-based, or alcohol-based solvent, an aprotic solvent, or a combination thereof, and may be used alone or in combination of two or more thereof.

[0134] Additionally, when using a carbonate solvent, a mixture of cyclic carbonate and chain carbonate can be used.

[0135] Depending on the type of lithium secondary battery, a separator may be present between the positive and negative electrodes. Such separators may include polyethylene, polypropylene, polyvinylidene fluoride, or a multilayer film comprising two or more layers of these materials.

[0136] The separator may include a porous substrate and a coating layer comprising an organic material, an inorganic material, or a combination thereof, positioned on one or both sides of the porous substrate.

[0137] The organic material may include a polyvinylidene fluoride polymer or a (meth)acrylic polymer.

[0138] The above inorganic materials are Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, It may include inorganic particles selected from, but not limited to, SrTiO3, BaTiO3, Mg(OH)2, boehmite, and combinations thereof.

[0139] The organic and inorganic substances may be mixed and present in one coating layer, or a coating layer including an organic substance and a coating layer including an inorganic substance may be present in a laminated form.

[0140] Fig. 13 is an exemplary diagram of a secondary battery module in which secondary batteries are arranged according to the aforementioned embodiment of the present invention. In accordance with the need for high-capacity secondary batteries for electric vehicle operation, a secondary battery module is manufactured by arranging and connecting a plurality of secondary battery cells in a transverse and / or longitudinal direction. A plurality of secondary batteries are arranged in a space formed by a pair of opposing end plates (68a, 68b) and a pair of opposing side plates (69a, 69b). The arrangement of the secondary batteries can be designed in terms of the arrangement direction and number to obtain desired voltage and current specifications.

[0141] Fig. 14 is an exemplary diagram of a secondary battery pack (70) configured to apply the secondary battery module illustrated in Fig. 13 to an actual product (e.g., an automobile). The secondary battery pack can be manufactured by embedding a plurality of secondary battery modules in a pack housing designed to be mounted on an actual product. The pack housing may include fasteners and electrical outlets necessary for mounting on a product. In Fig. 14, for convenience of illustration, bus bars for electrical connection of secondary batteries, a cooling unit, external terminals, and other related elements are omitted.

[0142] A secondary battery pack can be mounted on a vehicle. The vehicle may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle. The vehicle includes a four-wheel drive or two-wheel drive vehicle. FIG. 15 is a drawing illustrating a vehicle including the secondary battery pack illustrated in FIG. 14. FIG. 15 illustrates a secondary battery pack (70) according to an embodiment of the present invention mounted on the lower body of a vehicle (V). The vehicle (V) operates by receiving power from the secondary battery pack (70) according to an embodiment of the present invention.

[0143] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical idea of ​​the present invention and the equivalent scope of the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

[0144] <Explanation of symbols>

[0145] 40: electrode assembly, 41: first current collector, 42: second current collector, 43: first electrode tab, 44: second electrode tab, 51: case, 54a: first long side, 54b: second long side, 55a: first short side, 55b: second short side, 56a: upper surface, 56b: lower surface, 60: cap assembly, 61: cap plate, 62: first terminal, 63: second terminal, 64: electrolyte injection port, 65: notch, 66: vent, 67: connecting member, 68a 68b: end plate, 69a 69b: side plate, 70: secondary battery pack, 100: insulating tape, 110: lower attachment portion, 120: first long side attachment portion, 130: Second long side attachment part, 140 140': First short side attachment part, 150 150': Second short side attachment part, 160: First short side lower lining part, 170: Second short side lower lining part, 180: I-cutting part, 200: Insulating tape, 210 210': Lower side attachment part, 220: First long side attachment part, 230: Second long side attachment part, 240 240': First short side attachment part, 250 250': Second short side attachment part, 260 260': First short side lower lining part, 270 270': Second short side lower lining part, 280: I-cutting part, 290: Upper surface attachment part, 291: First terminal exposed part, 292: Second terminal exposed part, 293: rupture induction part, 293a: main line, 293b: auxiliary line, 294: rupture induction part, 300: first short side upper lining part, 310: second short side upper lining part, 320: first short side vertical lining part, 330: second short side vertical lining part, 340: lower side horizontal lining part, d: distance margin between the outer line of the first terminal (62) or the second terminal (63) and the boundary line of the first terminal exposed part (291) or the second terminal exposed part (292), V: automobile

Claims

1. Electrode assembly; A case in which the above electrode assembly is built-in; A cap plate including a terminal connected to the electrode assembly and bonded to the case; Including an insulating tape attached to the outer surface of the above case, A secondary battery, wherein the outer surface of the case includes a surface of the cap plate, and the insulating tape includes an upper attachment portion attached to the surface of the cap plate.

2. In the first paragraph, the upper surface attachment portion of the insulating tape is A secondary battery including a terminal exposure portion that passes through the terminal without covering the terminal.

3. A secondary battery in the second paragraph, wherein the distance between the boundary line of the terminal exposure portion and the outer line of the terminal is 0.5 to 1.5 mm.

4. In the first paragraph, the upper surface attachment portion of the insulating tape is A secondary battery including a rupture inducing portion that induces rupture of an upper surface attachment portion when a vent ruptures due to gas generated inside the case.

5. In the fourth paragraph, the rupture inducing part A secondary battery, which is a groove that is inserted to a certain depth in the direction of the thickness of the insulating tape.

6. In the fourth paragraph, the rupture inducing part A secondary battery that is completely cut through the entire thickness of the insulating tape.

7. In the first paragraph, the insulating tape A first side attachment portion attached to the first side of the above case, A second side attachment part attached to the second side of the above case, A first side attachment portion attached to the first side of the above case, A second side attachment portion attached to the second side of the above case, and A secondary battery further comprising a lower attachment portion attached to the lower surface of the case.

8. In the 7th paragraph, the lower attachment part of the insulating tape A secondary battery including a rupture inducing portion that induces rupture of an attachment portion when a vent ruptures due to gas generated inside the case.

9. In paragraph 7, the insulating tape A secondary battery further comprising a first short-side lining portion attached to a corner of a first short-side of the case, and a second short-side lining portion attached to a corner of a second short-side of the case.

10. In paragraph 9, the insulating tape A secondary battery further comprising a first I-cutting portion formed between the first short-side attachment portion and the first short-side lining portion, and a second I-cutting portion formed between the second short-side attachment portion and the second short-side lining portion.

11. An electrode assembly; a case in which the electrode assembly is built; an insulating tape attached to a secondary battery including a terminal connected to the electrode assembly and a cap plate bonded to the case, An upper attachment portion attached to the surface of the cap plate, A first side attachment portion attached to the first side of the above case, A second side attachment part attached to the second side of the above case, A first side attachment portion attached to the first side of the above case, A second side attachment portion attached to the second side of the above case, and An insulating tape for a secondary battery, comprising a lower attachment portion attached to the lower surface of the case.

12. In the 11th paragraph, the upper surface attachment part An insulating tape for a secondary battery, comprising a terminal exposure portion that passes through the terminal without covering the terminal.

13. An insulating tape for a secondary battery, further comprising a rupture inducing member that is ruptured by gas generated inside the case in the 11th paragraph.

14. In paragraph 11, A first side lining portion attached to a corner of the first side of the case; and An insulating tape for a secondary battery, further comprising a second short-side lining portion attached to a corner of the second short-side of the case.

15. In paragraph 11, A first I-cutting portion formed between the first short-side attachment portion and the first short-side lining portion; and An insulating tape for a secondary battery, further comprising a second I-cutting portion formed between the second short-side attachment portion and the second short-side lining portion.

16. Step of manufacturing the electrode assembly; A step of manufacturing a case in which the electrode assembly is built-in and inserting the electrode assembly; A step of manufacturing a cap plate on which a terminal connected to the electrode assembly is assembled and joining it to the case; A step of making an insulating tape to be attached to the outer surface of the above case; A method for manufacturing a secondary battery, comprising the step of attaching the insulating tape to the outer surface of the case, including the surface of the cap plate.

17. In the 16th paragraph, the step of manufacturing the insulating tape is An upper attachment portion attached to the surface of the cap plate, A first side attachment portion attached to the first side of the above case, A second side attachment part attached to the second side of the above case, A first side attachment portion attached to the first side of the above case, A second side attachment portion attached to the second side of the above case, and A method for manufacturing a secondary battery, comprising a step of cutting an insulating tape including a bottom attachment part integrally attached to the bottom of the case from a fabric.

18. In the 17th paragraph, the step of manufacturing the insulating tape is A method for manufacturing a secondary battery, further comprising a step of forming a terminal exposure portion that passes through the upper surface attachment portion without covering the terminal.

19. In the 16th paragraph, the step of manufacturing the insulating tape is A method for manufacturing a secondary battery, comprising a step of forming a rupture inducing portion that ruptures due to gas generated inside the case.

20. In paragraph 16, the step of attaching the insulating tape is Attach the above insulating tape to the surface of the cap plate; Attach the above insulating tape to the first and second sides of the case; Attach the insulating tape to the corners of the first and second short sides of the case; A method for manufacturing a secondary battery, comprising attaching the insulating tape to the first and second short sides of the case.

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